.top{
    width: 100%;
    height: 50px;
    background-color: #000;
    opacity: 0.4;
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 999; 
    .search{
        width:70% ;
        height: 30px;
        margin-left: 15%;
        color: #fff;
        border: 1px solid #fff;
        border-radius: 10px;
        position: absolute;
        top: 10px;
        padding-left: 40px;
        line-height: 30px;
        i{
            width: 32px;
            height: 32px;
            position: absolute;
            background: url("") -194px -92px no-repeat;
            background-size: 100% 100%;
            top: 5px;
            left: 5px;
        }
    
    }
}